From f7cf9699dc0570ab4bce6d077ba51c329644cf7e Mon Sep 17 00:00:00 2001
From: Xiao Ni <xni@redhat.com>
Date: Tue, 22 Dec 2015 11:09:34 +0800
Subject: [PATCH] Check and remove bitmap first when reshape to raid0

If reshape one raid device with bitmap to raid0, the reshape progress will
start. But it'll fail and lose some components. So it should remove bitmap
first.

Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.com>
---
 Grow.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Grow.c b/Grow.c
index 6dfb9c9c..89e4c341 100755
--- a/Grow.c
+++ b/Grow.c
@@ -1590,6 +1590,15 @@ int Grow_reshape(char *devname, int fd,
 		pr_err("Cannot increase raid-disks on this array beyond %d\n", st->max_devs);
 		return 1;
 	}
+	if (s->level == 0 &&
+	    (array.state & (1<<MD_SB_BITMAP_PRESENT)) &&
+	    !(array.state & (1<<MD_SB_CLUSTERED))) {
+                array.state &= ~(1<<MD_SB_BITMAP_PRESENT);
+                if (ioctl(fd, SET_ARRAY_INFO, &array)!= 0) {
+                        pr_err("failed to remove internal bitmap.\n");
+                        return 1;
+                }
+        }
 
 	/* in the external case we need to check that the requested reshape is
 	 * supported, and perform an initial check that the container holds the
-- 
2.47.3